SYMPOSIA PAPER Published: 01 January 1986

Evaluation of a Variable-Speed Impact Tester for Analysis of Impact Behavior of Plastics and Composites


The Rheometrics variable-speed impact tester (RVSIT) was evaluated with regard to the stability and reproducibility of the velocity and load signals. A drop in the speed of the probe was observed upon impact. The extent of the drop depends on the impact speed and the material tested. Mounting the load cell ahead of the impact rod was found to improve the reproducibility of load-deflection signals and to alleviate spurious postpuncture noise. A new rod was designed to apply circumferential loads on notched specimens. Load-deflection data obtained with this type of loading were used to calculate the dynamic critical stress intensity factors (SIF) for sheet molding compound (SMC) and reinforced reaction injection-molded (RRIM) polyurethane panels in the opening and the sliding modes.

Author Information

Kamal, MR
McGill University, Montreal, Canada
Samak, Q
McGill University, Montreal, Canada
Provan, J
McGill University, Montreal, Canada
Ahmad, V
McGill University, Montreal, Canada
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: D20
Pages: 58–80
DOI: 10.1520/STP19374S
ISBN-EB: 978-0-8031-4996-0
ISBN-13: 978-0-8031-0937-7